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Cronoestratigrafía global vs. escalas regionales en la enseñanza de la Geología: un ejemplo para el Ordovícico del área polar perigondwánica

Authors: Gutiérrez-Marco, J. C.; Sá, Artur A.; Bernárdez, Enrique; Sarmiento, Graciela N.;

Cronoestratigrafía global vs. escalas regionales en la enseñanza de la Geología: un ejemplo para el Ordovícico del área polar perigondwánica

Abstract

[ES] La Escala Cronoestratigráfica Internacional, jalonada por los estratotipos de límite global o GSSP, ha venido a clarificar y reemplazar el uso de muchos nombres estratigráficos obsoletos, pero tiene el inconveniente de que carece de conexiones directas con el registro estratigráfico no marino, o con muchas escalas cronoestratigráficas regionales (marinas o continentales). Muchas de ellas pueden utilizarse, a efectos operativos, para precisar la correlación dentro de cuencas sedimentarias concretas, o en dominios paleo(bio)geográficos bien definidos. A modo de ejemplo se presentan los avatares registrados por la escala cronoestratigráfica del sistema Ordovícico, nacida de unos estratotipos británicos históricos, que no pudieron consolidarse para construir la escala cronoestratigráfica global, sustancialmente distinta. La propia evolución conceptual de la escala británica desaconseja su uso más allá del ámbito regional británico-avalónico. Las dificultades de correlación del Ordovícico ibérico y de las altas paleolatitudes periondwánicas con la escala global, también justifica la adopción de una escala regional propia, fundada en la cronoestratigrafía bohemo-ibérica.

[EN] The International Chronostratigraphic Chart, defined by Global Stage sections and points (GSSPs), allows clarification and replacement of many obsolete stratigraphic names, but has the inconvenience that don’t offers a direct connection with the non-marine stratigraphic record, or with the multiple regional timescales, either marine or continental, that sucessfully work for certain sedimentary basins or within well-defined paleo(bio)geographic domains. The Ordovician chronostratigraphy is a good example of these difficulties. This system was originally derived from historical British stratotypes, none of which were retained in the redefinition of the global Ordovician scale. The conceptual evolution recorded by the British scale avoids its use outside of the British-Avalonian paleogeographic realm. The same difficulties of correlation of the global scale with the Iberian Ordovician and all the peri-Gondwanan high palaeolatitudianl areas justifies the adoption of a Bohemo-Iberian regional scale in order to provide more exact correlations.

Este trabajo es una contribución al proyecto “Cronoestratigrafía del Ordovícico ibérico y su correlación con la escala global” (IBEROR, CGL2012-39471) del Ministerio de Economía y Competividad.

Trabajo presentado en el XIX Simposio sobre Enseñanza de la Geología, celebrado en Manresa (España), del 11 al 16 de julio de 2016

Peer reviewed

Country
Spain
Related Organizations
Keywords

Gondwana, Spain, Cronoestratigrafía global, España, Regional scales, Escalas regionales, Ordovician, Correlaciones, Global chronostratigraphy, Ordovícico, Correlation

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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